Vania



W. K. NAYLOR INSULATOR STRUCTURE Original Fild April 16, 1927 Dec. 4, 1928.

Ga/vanrieo,

INVENTOR M70009 KA/ay /arr WITNESSES ATTORNEY Reissued Dec. 1928. v

' umr so]; STATES PATENT orF I-ic WILDIEEH KL N-ALYIJOR, OF" PITTSBURGH, PENNSYLVANIA, ASSiGNOR TO WESTING- HOUSE ELEcT-mc a anni.

INSULATOR STRUCTURE;

MANUFACTURING COMPANY," A COBIUMTION 0F PENNSYL--' 0111135110. 1,873,582,.dated-June12, 1928, Serial No, 184,223, filed April 1.6, 1927 Application for reissuerleaau uatas, 1928.. Serial No; 301,669.. 1

My, inventionrelatesto insulator structures andparticularly to insulator structures of the H S'P One objectoflfmy invention is toprov ide a structure of the. above-indicated characterthat. shall compensate for deleterious effects occurring between. constituent elements of-"the insulators asheretofore constructed;

Another object of my invention is to provide, an insulator. of the. pinstype that shall havebetter. holding cooperation between the insulatorandthepin.

Another object. arm. invention isto provide. an insulator of." tlie pin-type in which the. pin. shall? have holding. surface portions and: protective surface portions of. diiferent materials, whereby v an improved. structure is obtained. 1 I

A. further obj ect of my. inventionis to pro- Vide an insulator of the pin-type. that shall be sim 1e and-durable inconstructiomleconomic operation. In insulators of the pin-type,.i'n which the pins are cemented; in permanently fixed. relation to: the insulating members,

looseningofthe pins,.after. some period of serviceand forno apparent cause, has caused considerable trouble andexpense.v I I i I Ithasibeen found, in insulators employing galvanized-iron pins securedin position :by neat Portland cement, or similar. binder, that. disintegration of. the cement surfaces occursnext to-the;zinc coatings of the pins. This-disintegration or breaking away oflthe cement from, thezinc. coatings is evidenced by, fissures andfhollowed out areas. in the cement surfaces which may be seen by breaking. the. insulators. and. removing them from the. ins... J

owever, it islhighly desirable that.v the exposed portions offlthe pins. be protected againsttthe weather and, particularly. where ironpins are. employed, galvanized zinc coatings have provided:v adesirable combination of economy, durability and" effectiveness It ismy aim to eliminate. the above-mentioned objectionable feature. and. to. retain the desirahle features? of the coatings by selec tivelyxcoatingtlie pins on. certain exposed with the cement.

,tomanufacture; and effective. in} its surfaces thereotandleaving bare, or other wise treating,'the surfaces thati cooperate Accordingly, in practicing a preferred form of; my invention, I provide an iron pin inwliich the cemented end is to be left uncoated duringthe clipping of tlie pin in a zinc bath, by suitably coverin said end, with a temporary coating that will not/be affected. by the -zinc, and the remainder of the exposed pin surface being permitted to become galvanized. or coated in the usual manner.

T Figure 1 of the accompanyingdrawing is a side View, partially in section and partially 1n elevatlon, of aportion of an insulator structure of the pin type constructed in. ac-

cordance 'Withmy invention,

Fig-.2 is-an" enlarged detail. view of the upperportion'of thepin, shown in Fig. 1, illustrating one st'ep-inthe selective galvanizing-process by the use of 'a-temporary liquid coating, and I Fig: 3. is-a View, similar to Fig.2,illustrating the same step in the selective galva-- nizing process by the useof a-temporary mechanical covering. I

Referring to Fig; 1, an. insulator con 'structed in accordance With my invention may comprise, in general; a pluralityof'ihsulatingxparts or shellsv 2 3 and'l, anupper terminal member'fi and alower terminal memberorpin'Z'Q The members 2, 3,. and 4, preferably of refractory insulating. material, such as porcelain orglass, arefofusual fbrmihaving-sur- I face-creepage flanges or petti'coats 9 audinner' portions 10 nested,'one within another,

and securedtogetherby cement.

, l he upper terminal member 6 is preferably of metal and cemented to the'upper shell2, Thepin 7, preferably of iron: and of tubular form, has a portion of its length, at its upper end 12,.corrugated. or otherwise constitutedfor holding cooperation with a body ofyceinent. 14'. [This portion ofthe pin is preferably left bare or ungalvanized so that the cement or other bonding material. directl y engages the material. of the pin, al-

H bath in a usual manner, 'duringwhich operathough it" may be otherwise treated. for good holding cooperation with the cement or coated with material-which does not interfere with such cooperation.

The outer pin surface, from the ungalvanizedzportion 12 to the lowerend 15 there- 'of, is galvanized or similarly coated with a protective material, such as a zinc coating 11.

Inselectively coating the pin 7 ,afterit is received from the foundry, it is cleaned, in a usual manner, by subjecting it topa' hydrochloric-acid bath and a shot-blast operation.

, As illustrated in Fig. 2, the portion 12 of the pin may then be closed, as by a't'emporary plug 17 at its outer end, and coated, as indicated by a coating 18,'with a body of sodium silicate. This material may be applied by dipping or by means of a brush andisallo-wed todry in the form of a hard coating. v

The portion of the pin, that is to be galvanized, is dipped in hydrochloric acid, preferably only up to the lower edge of the portion 12, but, if splashing occurs, or the pin is sub merged, the sodium silicate is not affected.

The pin is next dipped in. the'g'alvanizing tion, the waterin the sodium silicate is driven off by the heat of the molten zinc. This operation causes the sodium silicate to swell to the form of a relatively thick layer of silic-ious material which preventscontact bement by the zinc when tween the zinc and the pin.

-The pin is dipped in water for cooling,

after which the silicious coating. is removed,-

as by brushing with a wire brush. The brushing operation is preferably performed in water to facilitate the removal of the silicious material. v

If the process has been correctly performed, the uncorrugate'd portion of the pin will be perfectly galvanized by the coating 11, while the port1on12 will be clean and ungalvanized.

I As illustrated in Fig. 3,:a modified process contemplateslthe use .ofa mechanical struce ture coating in the place of the coating 18 of sodium silicate. Such a mechanical coating may comprise material, such as a bodyof tape 20, that has been treated with sodium silicate or otherwise so constituted I as tobe unaf- .fected during immersion inthe zinc bath.

. The cap 6 is also subjected to thesame treatment, the inner surface 22 being covered by the temporary coating to prevent engagegalvanized.

By my invention, a structure of verylittle increasedcost, caused by the selective galvanizing, is obtained that provides more effective and permanent holdmg cooperation between the insulator and the ca and the pin, and protects the capand the pin against theweather as effectively as, the best insulators hereto fore employed. V While I have shown and described a particular form of my invention, changes may be the outer surface is 1 member and a supporting member therefor,

Y one of said members having a recess and the effected therein without departing from the spirit and scopethereof, as set forth in the appended claims.

I claim as my invention:

1. An insulator of the pin-type comprising an insulating member having a recess, and 2.

having only its exposed surface galvanized.

2. An insulator-- of the pin-type comprising an insulating member having a recess, and a pin having a portion cemented in position pincemented. in position inthe recess and V in said recess and a portion projecting therefrom, the cement being directly associated with the material of which the pinis'constructed and said projecting portion having a metal coating thereon.

3. An insulator of the pin-type comprisingan insulating member having arecess, and an iron pin having a portion cemented in position in said recess and a portion projecting therefrom, the cement being directly asso ciated with the iron of the pin and said projecting portion having a zinc coating thereon.

at. An insulator of thepin-type comprising an insulating member having a recess, and ametal pin having a portion of its length from one end thereofcemented in position in said recess and the remainder thereof outside theinsulator, the cement being directly associated with the'metal of which the pin is constructed and said outside portion having a galvanized coat'ingof different metal thereon.

5. An insulator of the pin-type comprising an insulating member having a recess, an iron pin having a portion disposed in'saidrecess and a portion outside the recess, a bodyof neat Portland cement or similar binder directly associated with the iron of the pin in the'recess and a zinc coatin'g on said outside portion of the pin.

an-insulating member having a recess, and a pin cemented in positionin the recess having a galvanized portion and a portion of difle'rent character for holding cooperation with the'cement. V i a An insulator comprising an insulating member and-a supporting member therefor, one'of said members having a recess and the other having a portion cemented in position insaid recess andfsaid supporting member having only its exposed surfacecoated with metal. j

'8. Anfinsulator comprising an insulating other'having a portion bonded in position in said recess and said supporting member having onlyit's exposed surface provided with a weather-protective coating.

9. An insulator comprising an insulating member and a member cooperatingtherewith,

one of said members having a recess and the other having a port-ion cemented position 1n sald recess andsaid' cooperatlng member 6. "An insulatorof the pin-type comprising having only its exposed surface coated with ing only exposed surface provided with a metal. Weather-protective coating.

10. An insulator comprising an insulating In testimony whereof, I have hereunto sub- 10 member andamember cooperatingtherewith, scribed my name this 17th day of August, 5 one of said members having a recess and the 1928;

other having a portion bonded in position in said recess and said cooperating member hav- .WILLIAM K. NAYLOR. 

